In the pro version (available as an in-app-purchase) you can choose from 18 different references including CDC and preterm data. ***Correct for preterm birth*** The app supports correction for preterm birth. For children born preterm you can change between the corrected and the actual age on the tap of a button. ***Calculate target height*** Use the Hermanussen formula to estimate target height and see the target height range in the height diagram. ***Maintain a patient data base*** Store patients and add further measurements on other occasions. There is a search function to quickly find a stored patient. ***Use imperial or metric units*** Global support for unit change. ***Export to pdf*** Export diagrams as pdf documents ready for use in your patient documentation. Download this valuable tool today to help you in your daily practise! Please note: use this app on your own responsibility. It is only intended as a help for self calculation of these values. Percentiles and z-values are linearly interpolated.